The couple pictured here leaving hospital with their daughter Charlotte

And of course the closer in age they are, the more they share of their childhoods and the more likely they are to be good friends growing up.

But there is a big part of me that is also wincing. Sorry Kate but having three so close together brings, errr, well there is no other way of putting it – CARNAGE.

I have three boys, Casper, eight-years-old, Ben, five-years-old, and Jesse, three-years-old, Mine were four and two when my youngest arrived.

This is what I quickly learned:

You need a big car. We went out and bought one the weekend after Jesse was born. Few cars are wide enough to fit in three child seats side by side (I’d recommend a Citroen Grand Picasso).

You will join The Three Mums Club – yes it exists. I still have friends with one or two kids, but somehow we spend most time with The Three Mums Club. They understand bulk buying food, have built up the volume level resilience and tend to be happier to roll with the chaos.

Kensington Palace had tweeted out the exciting news early as Kate is battling crippling nausea

Two eyes are never enough. It’s when you are distracted looking after one disaster that they really start to cause mischief. While cleaning up one toilet accident scene worthy of Trainspotting, my older two jumped on a bed with such glee they broke it – that was an expensive hotel stay. On another occasion, while dealing with an overflowing sink (they had turned on the taps after stuffing it full of toilet roll, leaves and cotton wool) my middle one climbed up on our chest of drawers and poured my nail varnish into his eyes.

Four hours is a good night’s sleep. Midnight feeds, growing pains, nightmares and tantrums chime as regularly as a grandfather clock.

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You can kiss your social life goodbye. Funnily enough there aren’t too many ready babysitting volunteers.

You won’t eat out as a family for years. We tentatively tried it again this summer and four broken glasses later, gave in and left the restaurant to its relative peace.

Of course Kate will have more domestic and childcare help than any of us could ever dream of – but that will only help to a point.

Because ultimately we have one lap and one pair of hands.

Feeding your newborn is really quite difficult when you have a toddler who also wants to be on your lap, drinking in your undivided attention. And the icing is the four-year-old who thinks they should also be the only one on your lap.

Kate Middleton has had to cancel royal engagements due to extreme morning sickness

Feeding your newborn is really quite difficult when you have a toddler who also wants to be on your lap, drinking in your undivided attention. And the icing is the four-year-old who thinks they should also be the only one on your lap.

That is the hardest part because there are so many times when only mummy will do.

But then of course that is the best part too.

My tip “embrace the chaos”.

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